A couple of ideas – use the leftover spaghetti or rice in a stir fry, or make lo-mein. You could serve the chili over top of the spaghetti noodles. Make chili dogs, chili frito casserole, serve over tortilla chips as nachos with cheese, onions, and anything else you like on nachos.
Mix the chili with cheese such as velveeta and serve as a dip for tortilla chips. Serve the chili over tater tots. Chili burritos.
Top a salad with the chili kind of like Wendy’s does. Use the spaghetti and make a frittata.